Molecular Line Observations in Two Dusty Star-Forming Galaxies at z = 6.9

Abstract

SPT0311-58 is the most massive infrared luminous system discovered so far during the Epoch of Reionization (EoR). In this paper, we present a detailed analysis of the molecular interstellar medium at z = 6.9, through high-resolution observations of the CO(6-5), CO(7-6), CO(10-9), [CI](2-1), and p-H2O(211-202) lines and dust continuum emission with the Atacama Large Millimeter/submillimeter Array (ALMA). The system consists of a pair of intensely star-forming gravitationally lensed galaxies (labelled West and East). The intrinsic far-infrared luminosity is (16 $\pm$ 4)$\times 10^{12}{\mathrm{L}}_{\odot }$ in West and (27 $\pm$ 4)$\times 10^{11}{\mathrm{L}}_{\odot }$ in East. We model the dust, CO, and [CI] using non-local thermodynamic equilibrium radiative transfer models and estimate the intrinsic gas mass to be (5.4 $\pm$ 3.4)$\times 10^{11}{\mathrm{M}}_{\odot }$ in West and (3.1 $\pm$ 2.7)$\times 10^{10}{\mathrm{M}}_{\odot }$ in East. We find that the CO spectral line energy distribution in West and East are typical of high-redshift sub-millimeter galaxies (SMGs). The CO-to-H2 conversion factor (${\alpha }_{CO}$) and the gas depletion time scales estimated from the model are consistent with the high-redshift SMGs in the literature within the uncertainties. We find no evidence of evolution of depletion time with redshift in SMGs at z > 3. This is the most detailed study of molecular gas content of a galaxy in the EoR to-date, with the most distant detection of H2O in a galaxy without any evidence for active galactic nuclei in the literature.

arXiv commentAccepted for publication in The Astrophysical Journal. 34 pages, 17 figures

References in corpus (130)

• emcee: The MCMC Hammer
• Planck 2015 results. XIII. Cosmological parameters
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• Star Formation in the Milky Way and Nearby Galaxies
• Interstellar Dust Grains
• The CO-to-H2 Conversion Factor
• How Massive Single Stars End their Life
• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• Rotating Nuclear Rings and Extreme Starbursts in Ultraluminous Galaxies
• Cool Gas in High Redshift Galaxies
• The IRAS Revised Bright Galaxy Sample (RBGS)
• A General Theory of Turbulence-Regulated Star Formation, From Spirals to ULIRGs
• Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• The Molecular Interstellar Medium in Ultraluminous Infrared Galaxies
• Dusty Star-Forming Galaxies at High Redshift
• 21-cm Tomography of the Intergalactic Medium at High Redshift
• Far Infrared and Submillimeter Emission from Galactic and Extragalactic Photo-Dissociation Regions
• A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34
• The CO-to-H2 Conversion Factor and Dust-to-Gas Ratio on Kiloparsec Scales in Nearby Galaxies
• The CO-to-H2 Conversion Factor From Infrared Dust Emission Across the Local Group
• An Analytic Model for the Evolution of the Stellar, Gas, and Metal Content of Galaxies
• A survey of molecular gas in luminous sub-millimetre galaxies
• The deepest Herschel-PACS far-infrared survey: number counts and infrared luminosity functions from combined PEP/GOODS-H observations
• Far Infrared Spectroscopy of Normal Galaxies: Physical Conditions in the Interstellar Medium
• On the effect of the Cosmic Microwave Background in high-redshift (sub-)millimeter observations
• Diagnostics of irradiated dense gas in galaxy nuclei. II. A grid of XDR and PDR models
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: The Redshift Distribution and Evolution of Submillimeter Galaxies
• Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81
• The Big Problems in Star Formation: the Star Formation Rate, Stellar Clustering, and the Initial Mass Function
• Black hole accretion and star formation as drivers of gas excitation and chemistry in Mrk231
• Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA
• The Intense Starburst HDF850.1 in a Galaxy Overdensity at z=5.2 in the Hubble Deep Field
• Validation of the equilibrium model for galaxy evolution to z~3 through molecular gas and dust observations of lensed star-forming galaxies
• Explaining the [CII]158um Deficit in Luminous Infrared Galaxies - First Results from a Herschel/PACS Study of the GOALS Sample
• Cosmic Chemical Evolution
• Galaxy growth in a massive halo in the first billion years of cosmic history
• A Compendium of Far-Infrared Line and Continuum Emission for 227 Galaxies Observed by the Infrared Space Observatory
• Highly-excited CO emission in APM08279+5255 at z=3.9
• Gravitational Lens Models Based on Submillimeter Array Imaging of Herschel-selected Strongly Lensed Sub-millimeter Galaxies at z>1.5
• ALMA Imaging and Gravitational Lens Models of South Pole Telescope-Selected Dusty, Star-Forming Galaxies at High Redshifts
• The CI lines as tracers of molecular gas, and their prospects at high redshifts
• Properties of Hi-GAL clumps in the inner Galaxy]{The Hi-GAL compact source catalogue. I. The physical properties of the clumps in the inner Galaxy ($-71.0^{\circ }<\ell <67.0^{\circ }$)
• The Formation of Submillimetre-Bright Galaxies from Gas Infall over a Billion Years
• Gas and Dust in the Cloverleaf Quasar at Redshift 2.5
• Herschel-ATLAS: a binary HyLIRG pinpointing a cluster of starbursting proto-ellipticals
• Molecular gas in extreme star-forming environments: the starbursts Arp220 and NGC6240 as case studies
• The Dust-to-Gas and Dust-to-Metals Ratio in Galaxies from z=0-6
• The Herschel Comprehensive (U)LIRG Emission Survey (HerCULES): CO Ladders, fine structure lines, and neutral gas cooling
• Star formation relations and CO SLEDs across the J-ladder and redshift
• Imaging the molecular gas in a submm galaxy at z = 4.05: cold mode accretion or a major merger?
• The molecular gas in Luminous Infrared Galaxies II: extreme physical conditions, and their effects on the X_{co} factor
• Herschel/PACS spectroscopy of NGC 4418 and Arp 220: H2O, H2^{18}O, OH, ^{18}OH, O I, HCN and NH3
• The nature of the [CII] emission in dusty star-forming galaxies from the SPT survey
• A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z>2
• The CO-H2 Conversion Factor in Disc Galaxies and Mergers
• A Survey of Atomic Carbon at High Redshift
• Dust temperature and CO-to-H2 conversion factor variations in the SFR-M* plane
• The Properties of the Interstellar Medium within a Star-Forming Galaxy at z=2.3
• The rapid assembly of an elliptical galaxy of 400 billion solar masses at a redshift of 2.3
• The Spectral Energy Distribution of CO lines in M82
• Evidence for CO shock excitation in NGC 6240 from Herschel SPIRE spectroscopy
• The redshift distribution of dusty star forming galaxies from the SPT survey
• ISM properties of a Massive Dusty Star-Forming Galaxy discovered at z ~ 7
• Effective destruction of CO by cosmic rays: implications for tracing H${}_2$ gas in the Universe
• The Rest-Frame Submillimeter Spectrum of High-Redshift, Dusty, Star-Forming Galaxies
• L'CO/LFIR Relations with CO Rotational Ladders of Galaxies Across the Herschel SPIRE Archive
• A Theory for the Excitation of CO in Star Forming Galaxies
• Resolving the ISM at the peak of cosmic star formation with ALMA - The distribution of CO and dust continuum in z~2.5 sub-millimetre galaxies
• ALMA observations of atomic carbon in z~4 dusty star-forming galaxies
• Gas phase Elemental abundances in Molecular cloudS (GEMS) I. The prototypical dark cloud TMC 1
• Molecular gas in the Herschel-selected strongly lensed submillimeter galaxies at z~2-4 as probed by multi-J CO lines
• The Complete Redshift Distribution of Dusty Star-forming Galaxies from the SPT-SZ Survey
• Testing massive star evolution, star-formation history and feedback at low metallicity : Spectroscopic analysis of OB stars in the SMC Wing
• The Spatially Resolved [CII] Cooling Line Deficit in Galaxies
• Atomic carbon at redshift ~2.5
• A Comprehensive View of a Strongly Lensed Planck-Associated Submillimeter Galaxy
• Supernova feedback in a local vertically stratified medium: interstellar turbulence and galactic winds
• Discovery of a Multiply-Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE Data
• Is atomic carbon a good tracer of molecular gas in metal-poor galaxies?
• Imaging the Molecular Gas in a z=3.9 Quasar Host Galaxy at 0.3" Resolution: A Central, Sub-Kiloparsec Scale Star Formation Reservoir in APM 08279+5255
• Using [CI] to probe the Interstellar Medium in z~2.5 Sub-Millimeter Galaxies
• Turbulent Gas in Lensed Planck-selected Starbursts at redshifts 1-3.5
• A Herschel Space Observatory Spectral Line Survey of Local Luminous Infrared Galaxies from 194 to 671 Microns
• Modelling [CI] emission from turbulent molecular clouds
• The Warm Molecular Gas Around the Cloverleaf Quasar
• Size bias and differential lensing of strongly lensed, dusty galaxies identified in wide-field surveys
• CO J=1-0 spectroscopy of four submillimeter galaxies with the Zpectrometer on the Green Bank Telescope
• Predictions for the spatial distribution of the dust continuum emission in 1<z<5 star-forming galaxies
• The properties of the interstellar medium of galaxies across time as traced by the neutral atomic carbon [CI]
• H2O emission in high-z ultra-luminous infrared galaxies
• Submillimeter Observations of Millimeter Bright Galaxies Discovered by the South Pole Telescope
• Herschel observations of water vapour in Markarian 231
• An ALMA multi-line survey of the interstellar medium of the redshift 7.5 quasar host galaxy J1342+0928
• Atomic Carbon in M82: Physical conditions derived from simultaneous observations of the [CI] fine structure submillimeter wave transitions
• Extended [CII] Emission in Local Luminous Infrared Galaxies
• HerMES: The Rest-Frame UV Emission and A Lensing Model for the z=6.34 Luminous Dusty Starburst Galaxy HFLS3
• Millimeter-wave Point Sources from the 2500-square-degree SPT-SZ Survey: Catalog and Population Statistics
• Spatially Resolved Interstellar Medium and Highly-Excited Dense Molecular Gas in the Most Luminous Quasar at z=6.327
• High-J CO SLEDs in nearby infrared bright galaxies observed by Herschel-PACS
• Water vapor in nearby infrared galaxies as probed by Herschel
• GBT Zpectrometer CO(1-0) Observations of the Strongly-Lensed Submillimeter Galaxies from the Herschel ATLAS
• A physical model for the [CII]-FIR deficit in luminous galaxies
• Submillimeter H2O and H2O+ emission in lensed ultra- and hyper-luminous infrared galaxies at z ~ 2-4
• Far-infrared Herschel SPIRE spectroscopy of lensed starbursts reveals physical conditions of ionised gas
• Neutral Carbon Emission in luminous infrared galaxies The \CI\ Lines as Total Molecular Gas Tracers
• Sub-kiloparsec Imaging of Cool Molecular Gas in Two Strongly Lensed Dusty, Star-Forming Galaxies
• Spatially Resolved [CII] Emission in SPT0346-52: A Hyper-Starburst Galaxy Merger at z~5.7
• Far-Infrared Properties of the Bright, Gravitationally Lensed Quasar J0439+1634 at z=6.5
• A dense, solar metallicity ISM in the z=4.2 dusty star-forming galaxy SPT0418-47
• CO Emission in Infrared-Selected Active Galactic Nuclei
• Resolved neutral carbon emission in nearby galaxies: [CI] Lines as Total Molecular Gas Tracers
• Full of Orions: a 200-pc mapping of the interstellar medium in the redshift-3 lensed dusty star-forming galaxy SDP.81
• Star Formation and ISM Properties in Host Galaxies of Three Far-infrared Luminous Quasars at $z\sim 6$
• HIFI Spectroscopy of ${\mathrm{H}}_2\mathrm{O}$ submm Lines in Nuclei of Actively Star Forming Galaxies
• Submillimetre galaxies in cosmological hydrodynamical simulations -- an opportunity for constraining feedback models
• Probing the full CO spectral line energy distribution (SLED) in the nuclear region of a quasar-starburst system at $z=6.003$
• Measuring Star-formation Rate and Far-Infrared Color in High-redshift Galaxies Using the CO (7-6) and [NII] 205 micron Lines
• Detection of Galactic and Extragalactic Millimeter-Wavelength Transient Sources with SPT-3G
• The [CII] Deficit in LIRGs and ULIRGs is Due to High-Temperature Saturation
• SPT0346-52: Negligible AGN Activity in a Compact, Hyper-starburst Galaxy at z = 5.7
• Imaging the Molecular Interstellar Medium in a Gravitationally Lensed Star-forming Galaxy at z=5.7
• Extreme conditions in the molecular gas of lensed star-forming galaxies at z~3
• Constraining the ISM properties of the Cloverleaf quasar host galaxy with Herschel spectroscopy
• How Dense is Your Gas? On the recoverability of LVG model parameters
• Spatially Resolved Water Emission from Gravitationally Lensed Dusty Star Forming Galaxies at z $\sim$ 3
• Recovering the Physical Properties of Molecular Gas in Galaxies from CO SLED Modeling
• The Ratio of CO to Total Gas Mass in High Redshift Galaxies
• Source structure and molecular gas properties from high-resolution CO imaging of SPT-selected dusty star-forming galaxies
• A luminous molecular gas pair beyond redshift 7

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• Warm Gas in the Vicinity of a Supermassive Black hole 13 Billion Years Ago
• Hot Diggity Dog: Simultaneous CO and Dust Modeling of the Most Luminous WISE Hot Dust-Obscured Galaxy Unveils Extreme Molecular Gas Excitation
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